Combination casing-wrench.



L. DUNN. GOMBINATION CASING WRENCH.

APPLICATION FILED OUT. 26, 1908.

Patented May 17, 1910.

A UNITED STATES PATENT I ornion.

WILLIAM L. DUNN, or GAVIOTA, CALIFORNIA.

communion casmc-wnnnon.

' To all whom it may concern:

"Be it known that I, \VILLIAM L. DUNN,.

a citizen of the United States; residing at Gaviota, inthe county of Santa Barbara and State of California, have invented a new and useful Combination Casing ivrench, of

which the following is a specification.

- open and removed from the casing.

' This invention relates to the class of apparatus for screwing and unscrewing well-Teasings, and the 0131601 18 to provide a wrench of minimum size and weight and maximum 'efliciencywlnch is capable vof use on various sr/Jes'of'oil-well-casmg m the simplest and most convenient manner.

This invention embraces features which are applicable to the wrench patented to me March 31, 1908 by Letters Patent of the United States, ho. 883,630, for apparatus for screwing well casings, in which only two. gripping members are shown, one of which is pivoted to a'lever.

The accompanying drawings illustrate ,the-

invention.

Figure 1 is a plan of a wrench embodying this invention "as the same appearsin the act of applying it to a well-casing. Dotted lines indicate a position when the .loose end gripping-member is brought to a stop by engagement of the roller in the crotch of the lever. Fig.2 is a side elevation showing the wrench .in process of turning the casing. Fig. 3 is'a perspective view of thewrench The bushings are omitted.- Fig. 4 is an enlarged perspective of one of the bushings detached. Fig.5 is a sectional detail on line acf', Fig. 1. 10, 11 and 12 are concave gripping members pivoted together by pins 13 and 14:.

15 is a roller pivoted at its axis by .apin '16 to the loose end of.the terminal grippingniember 12. i I

17 is a lever pivoted by a' pin. 18 to the 'grippmg-member 10 and provided with, a

"to prevent the roller from becoming die-- on aged from the crotch.

The grip ing-members 10 and 12 that havepivota connection with the lever 17 are each formed of side bars or llbS con-- nected together withppstsfm't di the ends of said ribs.

. 22, 2a are the ribsiof the gripping-mem-f Specification of Letters Patent. Patented hiay 17, .1910. Application filed October 2 1908. Serial No. 459,631.

bers 12; and2 1', 25 are the posts thatconnect the'same. The ends of the ribs 22, 23 project beyond the posts to receive between them at one end the knuckle 26 of the inceive between them at the other end 'the roller 15.

:27 28 are the ribs of the member 10; and

gripping-member 10, said ribs 27, 28 project to receive between them the operating mcmher or lever 17. v

The inside faces of the gripping-members 10,- 11 and 12 are semicircular in form and adapted when brought together upon the casing to fit the same tightly, and each .Of said faces is provided with two seats 32, 33, to receive tongues on a bushing 35.

.36 designates fasteners pivoted by. bolts a to the bushings and adapted to swing to and from position to engage the grippingmember to hold the bushing in place when the tongues are seated in the seats; said seats extend only part way across the gripping member, and said ribs extend a corresponding distance across the bushing so that when the bushing is seated with its ribs at the bottom of the seats the fasteners may be turned to engage the grippirig-member, thereby to retain the bushing on said member when the wrench is turned upside down.

37 designates a connection fastened to eyes 38, 39, one of which is on the post 30 of the member 10 and the other is on the lever 17. By'nieans of this connection the .wrench may bc'suspendedj for ready applithe same width as the'gripping faces the members 10, 12. Y

In practical' use for large-pipe or-casmg the ipping-members will be'uscd without any ushings. -For pipe or casing of smaller diameters, bushings'of appropriate size will be mo intedwithin" the grippingmeinbers so that the wrenclrwillfit the smaller cas insor Pipe termediate clamping-member 11 and to reworkman will, by means of the lever 17,

swing the gripping-members into position againstthe casing, and the loose or free end of thegripping-member 12 will then be vswung around until the roller 15 comes into crotch 19, whereupon it will engage the innermost prong of said crotch. 'lhereupon the workman will bring the chain 21 around in place to engage the retainer 20. Then the handle will be 0 erated by the jerk-line 41 and draw back 42 indicated in dotted lines in Fig. 1, as explained in my former patent, thereby screwing or unscrewing the casing as the ease'may be. As the lever is moved the purchase formed by the crotch 19 grips the roller tightly and said roller turns on its pivot 16 so that the friction between the lever and the gripping member is negligible. home and it is desired to unscrew it, the easing-wrench may be turned upside down and the lever operated in thegeverse direction after the manner'detailed in my said former patent. r

The bushings are made in sets of three, those of each set being alike and those of all the sets being interchangeable.

The bushings-are eta-skeleton form, as shown in Fig. 4, the same being ribbed on the side opposite the gripping faces to rest upon the gripping faces of the gripping members 10, 11 and 12. This together with the'skeleton form of the gripping members 10 and 12, greatly reduces the weight of the two especially in the case of thick bushings for handling smaller sizepipe.

By providing the roller on the gripping member instead of on the lever, a reduction in the size of the lever is possible that greatly reduces the weight of the tool.

I claim:

-l. A wrench comprising a plurality of gripping members pivoted together, a roller pivoted at. its axis to one of said gripping members, and a lever pivoted to another of sa d gripping members and provided with a purchase to engage the roller.

.2.'A' wrench comprising a plurality of gripping members, a roller pivoted. at its axis to one of the gripping members, and a lever pivoted to another of said gripping members and provided with a crotch to en- 'age the roller to tighten the gripping memers.

3. A plurality of gripping members pivoted together, an antifriction roller mom of said members, a lever pivoted to another of said members and provided with-a crotch to engage said roller, and releasable means foflholding the lever in engagement with the re er.

4. A wrench comprising a middle grip When the casing has been screwed ping member, two gripping members respectively pivoted to the ends thereof, and

each formed of ribs provided with posts in-' termediate the ends of the ribs so that the ends of the ribs reject to receive pins, the middle member eing provided with a retainer, a roller pivoted to projecting ribs at one end of one of the end members, a lever pivoted between the projecting ribs of the other end member and arranged to engage 6. A casing wrench provided with gripping members and with skeleton bushings to fit inside the gripping faces of the gripping members, said bushings being detachably fastened to the gripping members. 7. A casing wrench provided with gripping members and-with skeleton bushings for the gripping faces of said members, said gripping members. 8. A .easmg wrench provided wlth gripping faces and ribbed skeleton bushings to fit said gripping faces, the bushingsbeing detachably fastened to said faces.

9. A casing wrench provided with ribbed bushings to fit the gripping faces of the wrench, said bushings being detachably fastened to said faces.

10. A easing wrench provided with seats in their gripping faces, bushings adapted to fit said faces and having feathers to fit said seats and latches pivoted to said bushings to engage saidgripping members to hold the bushings seated.

11. A wrenchcomprising a plurality of concave gripping members pivoted together, a roller pivoted to the terminal of one of said gripping members'and a lever pivoted to the terminal of another of said gripping members and provided with a purchase to engage the roller.

12. A wrench comprisingja plurality'of concave gripping members, a roller pivoted to one of the gripping members and a lever pivoted to another. of said gripping members and provided with a crotchto engage the roller to tighten the gripping members.

In testimony whereof, I have hereunto set my hand at Los Angeles, California, this 19th day of October, 1908.

WILLIAM L. DUNN.

Tn presence of-- 5 JAMES R. TOWNSEND, M. Brennan TOWNSEND.

bushings being detachably fastened to said 

